I had to disassemble the Gems housing, disconnect the battery, and connect the speaker and circuit board in line with the BlueRail board circuitry. Had to install a voltage regulator to drop the voltage down from 9.6v to a safe level for the Gems circuit. During installation found the Gems housing was too big so I left it off, plus had to trim the bottom which holds the board, so it would fit inside the E7 body.

Just to be clear, the APP doesn't pair with a speaker. You pair your phone/tablet with a speaker, which routes all sounds to the speaker (regardless of what APP you are running). Pairing is generally done from the Settings/Bluetooth area in your phone/tablet. If you are having problems pairing your device to a bluetooth speaker, I would google "(name of device) can't pair bluetooth" and see what you find.